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(No Model.)

J. 0. WILLIAMS PIPE THREADING DIE.

No. 425,394. Patented Apr. 8, 1890.

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UNITED STATES PATENT FFICE.

JAMES C. WILLIAMS, OF ERIE, PENNSYLVANIA, ASSIGNOR. TO THE JARECKI MANUFACTURING COMPANY, (LIMITED,) OF SAME PLACE.

PlPE-THREADING DIE.

SPECIFICATION forming part of Letters Patent No.425,394, dated April 8, 1890. Application filed December 2, 1889. $erial No. 332,316. (No model.)

To all whom it may concern.-

Be' it known thatI, JAMES C. WILLIAMs, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsyl- Vania, have invented certain new and useful Improvements in Adjustable Pipe-Threading Dies; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use-the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon forming part of this specification.

My invention consists in the improvements in adjustable pipe-threadin g dies hereinafter set forth and explained, and illustrated in the accompanying drawings, in which- Figure 1 is a perspective view of my improved pipe-threading die. Fig. 2 is a plan view of same with the cam-plate for adjusting the threading-dies removed. Fig. 3 is a plan view of the under side of the die cam-plate. Fig. 4: is a plan view of the adjustable pipe-guide mechanism in the opposite end of the die, a portion of the cam-plate for adjusting the guides being broken away,

so as to show the guide-locking mechanism.

Like letters refer to like parts in all of the figures.

In the construction shown of my improved pipe-threading die, A is the body of the die, and B B the removable handles thereof. Through the center of the body A, I make an opening C of sufficient size to receive the pipe to be threaded. In the end of the body A in which the threading-dies operate I out four radial grooves D D D D, these grooves being of sufficient depth, so that the tops of the dies (1 (1 cl d, when in place therein, are flush with the end A of the body A. In the end A of the body A, I also cut an annular groove E, and centrally in the dies (Z, I cut transverse slots 8 of the same depth as the annular groove E, the dies (Z being provided with threads on both ends thereof, so as to be reversible.

On the opposite sides of the periphery of the end A of the body A, I provide ears (I, a, in which thumb-screws b h operate. Over the end A of the body A, I place a cam-plate F, Fig. 3, constructed, preferably, with a continuous cam f on the underside thereof, which fits into the transverse groovese in the dies (1-, the outermost portions f of the cam f' contacting with the outside wall E of the groove E, which parts so contacting form a bearing for the plate F, preventing any lateral motion thereof on the body A, while it freely rotates thereon, the continuous cam *f operating in the slots 6 in the dies (Z when the plate F is rotated on the body A to move them in and out simultaneously.

The cam F is made continuous for the purpose of strength and stability of operation. On the opposite sides of the cam-plate F, I make slots G G, through which the thumbserews b b pass into the ears a a on the body A, by means whereof the plate F can be firmly clamped down upon the end A of the bodyA and also upon the dies (1 therein, so as to firmly lock them at any desired point, by. which construction I am enabled to do away with the rings heretofore used in the construction of pi pe-threading dies to retain the dies and die-plate in place. In one end of each of the slots G,-I make an opening g of sufficient size to pass over the shanks of the thumb-screws b, so that by loosening the screws 1) the cam-plate F can be quickly removed for changing the dies (1 or for any other purpose desired. A handle H is also provided on one side of the cam-plate F for conveniently rotating it. cam-plate F and the periphery of the body A scales (not shown) may be provided, if de .sired, for the convenient adjustment of the dies to different-sized pipe. In the opposite end A of the body A, I out four radial slots I I I I, in which fourpipe-guides J J J J operate. I also turn oif the end A of the body A, so as to leave a collar C around the central opening C of sufficient length to form a This cam-plate K is provided with four camslots 7c c t It, in which stud-pins i e i i on the pipe-guides J J J J operate. The cam-plate K is preferably provided with a milled edge K, so that it can be conveniently rotated on the collar C". Cap-screws h h in the end of the collar C, the heads of which overlap the edge of the cam-plate K, retain it in place. Between two of the pipe-guides J, I mill out in the end A of the body an annular recess On the edge of the.

bearing, upon which acam-plate K rotates.

N, in which is placed acurved block of metal 0, and through the periphery of the body A is a thumb-screw P, which projects into the recess N, so as to contact centrally with the periphery of the curved metal block 0, and by means of this device the guides J, having been adjusted as desiredviz., by rotating the cam-plate K on the body A-can be firmly secured and locked, so as to prevent any ra- 1o dial movement thereof.

I am aware that cams secured to revolving plates are common in pipe-threading dies; but in all cases, so far as I am aware, such cams have been made separate from each I 5 other, and not continuous, as I make them.

I am also aware that rotating cam-plates having an annular slot on one side thereof, with athumb-screw passing through such slot into a like slot on one side of the body of the die, are in use. This method of fastening the plate, however, only clamps it to the body A at one side, but does not clamp it down upon the dies, while in my construction I clamp the entire plate down upon the dies, so as to 2 5 firmly secure them in place, thus makingthem,

when inoperation, substantially solid dies.

IIavingthus fully described my invention, so as to enable others to construct and use the same, what I claim as new, and desire to secure by Letters Patent of the United States,

1. The combination,inapipe-threading die, of radially-moving thread-cutting dies operating in radial slots in one end of the die- $5-hody with a rotating cam-plate having a con- '-tinfI: us cam thereon operating in transverse slots in said dies and adapted to be clamped down thereon, substantially as and for the purpose set forth.

o 2. The combination, in a pipe-threading die,

of a rotating cam-plate having cam-surfaces on the under surfaces thereof and radiallymoving dies operated by said cams with annular slots on opposite sides of said cam-plate and thumb-screws passing through said slots into ears on the body of the die,substantially as and for the purpose set forth.

3. The combination, in the rotating can1- plate of a pipe-threading die, of a continuous camengaging with and operating radiallymoving threading-dies with thumb-screws passing through annular slots through opposite edges of said plate into ears on the body, said slots having enlarged openings at one end of each'of said slots adapted to pass over the heads of said thumb-screws, substantially as and for the purpose set forth.

4. The 00 mbination, in a pipe-threading die, of radially-moving pipe-guides operating in radial slots in the opposite end of the diebody from that in which the threading-dies operate, with a rotating cam-plate engaging with and operating said pipe-guides, and a locking device adapted to engage with one or more of said pipe-guides and look all of the pipe-guides in any desired position, substantially as and for the purpose set forth.

5. The combination,inapipe-threading die, of a die-body A, having a central opening (J therein,.an annular groove E in the end A, a V

projecting collar 0" in the end A thereof, radial die-slots D in the end A, and radial guide-slots I in the end A thereof, with threading-dies d, a cam-plate F, having a continuous cam f thereon engaging with and operating said threading-dies, and also slots-G, through which thumb-screws I) operate, a camplate K, having cam-slots is, engaging withand operating radially-moving pipe-guides J, and a curved locking-block O and thumb- 8o screw P, operatingin a recess N in the end A of the die-body between two of the pipeguides J, substantially as and for the purpose set forth.

In testimony whereof Iaffix my signature in 8 5 presence of two witnesses.

JAMES C. \VILLIAMST----}M\\ Witnesses:

WM. P. HAYES, J. C. STURGEON. 

